MFH: r484453

mail/nullmailer: Unbreak build with Clang 6 (C++14 by default)

inject.cc:221:3: error: non-constant-expression cannot be narrowed from type 'size_t' (aka 'unsigned long') to 'unsigned int' in initializer list [-Wc++11-narrowing]

X(Errors-To,         T,F,F,F,F), // 5
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

http://beefy12.nyi.freebsd.org/data/head-amd64-default/p483866_s340093/logs/nullmailer-1.13_3,1.log

PR: 230496
Submitted by: Tod McQuillin <devin@spamcop.net>

Approved by: ports-secteam blanket